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flavor-code: Malicious npm security report (Block) | LPM Firewall

registry / flavor-code / 1.3.17

flavor-code@1.3.17

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AI Security Review

scanned 4h ago · by lpm-firewall-ai

Running the package's init command plants a fixed OAuth provider in the current project. A later login sends OAuth authorization material to the configured private-network gateway.

Static reason

One or more suspicious static signals were detected.; previous stored version diff introduced dangerous source

Trigger

The user runs /init and then logs in with the generated provider.

Impact

An operator at the fixed host can receive authorization-code exchange material and control the returned provider configuration.

Mechanism

Persistent OAuth redirect to a hard-coded gateway.

Attack narrative

The package exposes an init command that creates .flavor/flavor.json with fixed OAuth authorization and token endpoints on 192.168.1.100. When the user later logs in, the OAuth implementation posts the authorization code, redirect URI, client ID, and verifier to that configured token endpoint. This persists a credential-routing choice in the project rather than asking the user to choose the provider endpoint. There is no install hook, but the explicit command still establishes a concrete credential-exfiltration path.

Rationale

The fixed, non-user-selected OAuth gateway is persisted by init and receives authorization-code exchange data during login. The absence of an install hook reduces automatic exposure but does not remove the credential-routing behavior.

Evidence

dist/desktop/main.jspackage.json.flavor/flavor.jsonFLAVOR.md.gitignore.flavor/plugins/astgraph

Network endpoints2

/authorize

Source & flagged code

14 flagged · loading source

dist/cli-main.jsView file

656kind = "local"; L657: exec(request, signal) { L658: const cancellation = signal ?? new AbortController().signal;

High

Child Process

Package source references child process execution.

dist/cli-main.jsView on unpkg · L656

dist/desktop/main.jsView file

7401} L7402: if (["powershell", "pwsh"].includes(name)) { L7403: const flag = args.findIndex((arg) => ["-command", "-c"].includes(arg.toLowerCase()));

High

Shell

Package source references shell execution.

dist/desktop/main.jsView on unpkg · L7401

8821function runShellHandler(descriptor, event, signal) { L8822: return new Promise((resolve41, reject) => { L8823: const child = spawn(descriptor.command, [...descriptor.args ?? []], { L8824: env: { ...process.env, ...descriptor.env }, L8825: shell: false,

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

dist/desktop/main.jsView on unpkg · L8821

•Manifest-reachable source captures an API credential, sends it to a fixed unofficial gateway, and persists that redirection in agent or shell configuration. dist/desktop/main.js: import { readFile as readFile39, stat as stat18, writeFile as writeFile19 } from "fs/promises"; baseURL: z.string().trim().url().max(2048).refine((value) => { baseURL: z2.string().url().optional(), authorizationUrl: z2.string().url().optional(), await handle.writeFile(data2); baseURL: HttpUrlInput, async function runInteractionManifest(manifest, baseUrl, createDriver) { if (!isLoopbackPreviewUrl(baseUrl)) throw new Error("D2C interaction preview must use a loopback HTTP URL");

High

Credential Redirect Persistence

Manifest-reachable source sends a prompted API credential to a fixed unofficial gateway and persists the redirection.

dist/desktop/main.jsView on unpkg

•Manifest-reachable source resolves another installed package, overwrites its runtime code, and injects package-defined remote behavior. dist/desktop/main.js: import { readFile as readFile39, stat as stat18, writeFile as writeFile19 } from "fs/promises"; await handle.writeFile(data2); var DesktopMessageDeliverySchema = z3.enum(["prompt", "steer", "followUp"]); import { copyFile, mkdir as mkdir2, open as open2, readFile, rename as rename2, rm as rm2, stat, unlink } from "fs/promises"; var defaultFileOperations = { rename: rename2, copyFile, unlink }; await handle.writeFile(token, "utf8"); await handle.writeFile(content, "utf8"); await operations.copyFile(temporary, path);

High

Entrypoint Foreign Package Code Overwrite

Manifest-reachable source overwrites another installed package with package-defined remote behavior.

dist/desktop/main.jsView on unpkg

8860if (code !== 0) { L8861: reject(new Error(`Shell hook exited with code ${code}: ${stderr.trim()}`)); L8862: return; ... L8864: try { L8865: resolve41(HookDecisionSchema.parse(JSON.parse(stdout))); L8866: } catch (error) { ... L8869: }); L8870: child.stdin.end(JSON.stringify(event)); L8871: }); ... L8875: if (process.platform === "win32") { L8876: const killer = spawn("taskkill", ["/pid", String(child.pid), "/t", "/f"], { L8877: stdio: "ignore",

High

Command Output Exfiltration

Source combines command execution, command-output handling, and outbound requests; review data flow before blocking.

dist/desktop/main.jsView on unpkg · L8860

8860Trigger-reachable command-output exfiltration chain: manifest.main -> dist/desktop/main.js L8860: if (code !== 0) { L8861: reject(new Error(`Shell hook exited with code ${code}: ${stderr.trim()}`)); L8862: return; ... L8864: try { L8865: resolve41(HookDecisionSchema.parse(JSON.parse(stdout))); L8866: } catch (error) { ... L8869: }); L8870: child.stdin.end(JSON.stringify(event)); L8871: }); ... L8875: if (process.platform === "win32") { L8876: const killer = spawn("taskkill", ["/pid", String(child.pid), "/t", "/f"], { L8877: stdio: "ignore",

High

Trigger Reachable Command Output Exfiltration

A manifest entrypoint or package-local install chain reaches command-output exfiltration behavior.

dist/desktop/main.jsView on unpkg · L8860

4import { readFile as readFile39, stat as stat18, writeFile as writeFile19 } from "fs/promises"; L5: import { basename as basename11, dirname as dirname25, join as join48, resolve as resolve40 } from "path"; L6: import { fileURLToPath as fileURLToPath4 } from "url"; ... L46: try { L47: parsed = JSON.parse(unfenced); L48: } catch { ... L408: } L409: return { ...input, data: data2 }; L410: } ... L1140: const onRenderProcessGone = (_event, details) => { L1141: recordRendererDiagnostic(`renderer process ${details.reason} (exit ${details.exitCode})`); L1142: };

Low

Weak Crypto

Package source references weak cryptographic algorithms.

dist/desktop/main.jsView on unpkg · L4

dist/astgraph/vendor/tree-sitter.jsView file

2977var func = `(${args}) => { ${body} };`; L2978: ASM_CONSTS[start] = eval(func); L2979: }

Low

Eval

Package source references a known benign dynamic code generation pattern.

dist/astgraph/vendor/tree-sitter.jsView on unpkg · L2977

dist/astgraph/index.jsView file

29async function mod(name) { L30: return import(new URL(`./${name}`, import.meta.url).href); L31: }

Medium

Dynamic Require

Package source references dynamic require/import behavior.

dist/astgraph/index.jsView on unpkg · L29

dist/desktop/plugin-worker-entry.jsView file

28const signal = Object.freeze({ aborted: false, reason: undefined, addEventListener() {}, removeEventListener() {}, throwIfAborted() {} }); L29: const cloneJson = (value) => value === undefined ? undefined : JSON.parse(JSON.stringify(value)); L30: const deepFreeze = (value) => {

Medium

Unsafe Vm Context

Package source executes code through a VM context API.

dist/desktop/plugin-worker-entry.jsView on unpkg · L28

dist/cli.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = flavor-code@1.3.16 matchedIdentity = npm:Zmxhdm9yLWNvZGU:1.3.16 similarity = 0.983 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

dist/cli.jsView on unpkg

11Cross-file remote execution chain: dist/cli.js spawns dist/desktop/main.js; helper contains network access plus dynamic code execution. L11: // src/launcher.ts L12: import { spawn } from "child_process"; L13: import { realpathSync, readFileSync } from "fs"; ... L50: try { L51: marker = parseMemoryRestartMarker(readFileSync(memoryRestartMarkerPath(process.cwd()), "utf8")); L52: } catch { ... L56: if (resumed !== void 0) { L57: process.stderr.write(`flavor launcher: heap watermark restart, resuming session ${marker.sessionId} L58: `);

High

Cross File Remote Execution Context

Source spawns a local helper that also contains network and dynamic execution context; review data flow before blocking.

dist/cli.jsView on unpkg · L11

dist/astgraph/vendor/tree-sitter.wasmView file

•path = dist/astgraph/vendor/tree-sitter.wasm kind = wasm_module sizeBytes = 205488 magicHex = [redacted]

Medium

Ships Wasm Module

Package ships WebAssembly modules.

dist/astgraph/vendor/tree-sitter.wasmView on unpkg

Source & flagged code

14 flagged

dist/cli-main.jsView file

Lines 636-676javascript

636 this.#pending = void 0;

637 }

638};

639function streamChunks(content, maxChars = 2048) {

640 if (!content) return [];

641 const chunks = [];

642 for (const line of content.match(/[^\n]*\n|[^\n]+$/g) ?? []) {

643 for (let offset = 0; offset < line.length; offset += maxChars) {

644 chunks.push(line.slice(offset, offset + maxChars));

645 }

646 }

647 return chunks;

648}

649

650// src/eval/cli.ts

651import { readFile as readFile2, writeFile as writeFile2 } from "fs/promises";

652import { dirname, resolve as resolve2 } from "path";

653

654// src/execution/local.ts

655var LocalExecutionEnvironment = class {

656 kind = "local";

657 exec(request, signal) {

658 const cancellation = signal ?? new AbortController().signal;

High

Child Process

Package source references child process execution.

dist/cli-main.jsView on unpkg · L656

659 return executeShell(request.cwd, {

660 command: request.command,

661 args: [...request.args],

662 cwd: request.cwd,

663 ...request.timeoutMs === void 0 ? {} : { timeoutMs: request.timeoutMs }

664 }, cancellation, DEFAULT_MAX_OUTPUT_BYTES);

665 }

666 async dispose() {

667 }

668};

669

670// src/eval/schema.ts

671import { z } from "zod";

672var EvaluationSpecSchema = z.object({

673 name: z.string().trim().min(1).max(256),

674 workspace: z.string().trim().min(1).max(32768),

675 prompt: z.string().trim().min(1).max(1e6),

676 verification: z.array(z.object({

dist/desktop/main.jsView file

7401} L7402: if (["powershell", "pwsh"].includes(name)) { L7403: const flag = args.findIndex((arg) => ["-command", "-c"].includes(arg.toLowerCase()));

High

Shell

Package source references shell execution.

dist/desktop/main.jsView on unpkg · L7401

8821function runShellHandler(descriptor, event, signal) { L8822: return new Promise((resolve41, reject) => { L8823: const child = spawn(descriptor.command, [...descriptor.args ?? []], { L8824: env: { ...process.env, ...descriptor.env }, L8825: shell: false,

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

dist/desktop/main.jsView on unpkg · L8821

•Manifest-reachable source captures an API credential, sends it to a fixed unofficial gateway, and persists that redirection in agent or shell configuration. dist/desktop/main.js: import { readFile as readFile39, stat as stat18, writeFile as writeFile19 } from "fs/promises"; baseURL: z.string().trim().url().max(2048).refine((value) => { baseURL: z2.string().url().optional(), authorizationUrl: z2.string().url().optional(), await handle.writeFile(data2); baseURL: HttpUrlInput, async function runInteractionManifest(manifest, baseUrl, createDriver) { if (!isLoopbackPreviewUrl(baseUrl)) throw new Error("D2C interaction preview must use a loopback HTTP URL");

High

Credential Redirect Persistence

Manifest-reachable source sends a prompted API credential to a fixed unofficial gateway and persists the redirection.

dist/astgraph/vendor/tree-sitter.jsView file

Lines 2957-2997javascript

2957 "env": proxy,

2958 "wasi_snapshot_preview1": proxy

2959 };

2960 function postInstantiation(module, instance) {

2961 updateTableMap(tableBase, metadata.tableSize);

2962

dist/astgraph/index.jsView file

Lines 9-49javascript

9// inside the host's activation timeout; WASM grammars and the database load on

10// first use.

11

12import { existsSync } from "node:fs";

13import { isAbsolute, join, relative } from "node:path";

14

15import { z } from "./vendor/zod/index.js"

dist/desktop/plugin-worker-entry.jsView file

Lines 8-48javascript

8var CONTRIBUTION_NAME_SOURCE = "^[a-zA-Z0-9][a-zA-Z0-9._:-]{0,127}$";

9var data = workerData;

10var port = parentPort;

11if (port === null) throw

dist/cli.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = flavor-code@1.3.16 matchedIdentity = npm:Zmxhdm9yLWNvZGU:1.3.16 similarity = 0.983 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

dist/cli.jsView on unpkg

11Cross-file remote execution chain: dist/cli.js spawns dist/desktop/main.js; helper contains network access plus dynamic code execution. L11: // src/launcher.ts L12: import { spawn } from "child_process"; L13: import { realpathSync, readFileSync } from "fs"; ... L50: try { L51: marker = parseMemoryRestartMarker(readFileSync(memoryRestartMarkerPath(process.cwd()), "utf8")); L52: } catch { ... L56: if (resumed !== void 0) { L57: process.stderr.write(`flavor launcher: heap watermark restart, resuming session ${marker.sessionId} L58: `);

High

Cross File Remote Execution Context

Source spawns a local helper that also contains network and dynamic execution context; review data flow before blocking.

dist/cli.jsView on unpkg · L11

dist/astgraph/vendor/tree-sitter.wasmView file

•path = dist/astgraph/vendor/tree-sitter.wasm kind = wasm_module sizeBytes = 205488 magicHex = [redacted]

Medium

Ships Wasm Module

Package ships WebAssembly modules.

dist/astgraph/vendor/tree-sitter.wasmView on unpkg